Hinge type door check



vfl-IINGE TYPE DOOR CHECK Filed June 13. 1966 FlG-1 INI/Emol;

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United States Patent O 3,449,788 HINGE TYPE DOOR CHECK Kiyoyasu Wake, 378 Kinuta-machi, Setagaya-ku, Tokyo, Japan Filed June 13, 1966, Ser. No. 557,083 Int. Cl. Ef 3/20, 3/22 U.S. Cl. 16-54 1 Claim ABSTRACT OF THE DISCLOSURE A hinge-type hydraulic door check positioned within a door including a cylinder having one end rigidly attachable to one arm of a door hinge, and a slidable piston pivotally linked to the other arm of said door hinge.

A hinge type door lcheck comprising a cylinder having one end rigidly attachable to one arm of a door hinge, a link pivotably attachable to the other arm of a door hinge, a piston slidable in uid tight engagement within said cylinder, said piston having a piston rod thereon extending toward said one end of the cylinder and to which said link is pivotally attached, a fluid tight packing in said cylinder around said piston rod and through which n said piston rod extends in fluid tight sliding relationship, a one way valve in said piston permitting uid to pass only from the side of the piston facing said one end of the cylinder to the other side of the piston, and an adjustable bypass valve on said cylinder providing a bypass for the iluid from said other side of said piston to said one side of said piston, said check valve comprising a ap of ilexible uid impervious material on the said other side of said piston having one segment secured to the face of said piston on said other side and said piston having a plurality of ports over which said flap is positioned, said packing having a face facing said piston and acting as a shock absorber when struck by said piston at the extremity of the piston movement toward said one end of said cylinder, and said piston having at the other end thereof an adjustable inner bottom and a further packing between said inner bottom and the said other end of said cylinder, and means connected to said inner bottom for moving said inner bottom toward said other end of said cylinder and compressing said packing to force it against the cylinder wall and provide a fluid tight seal.

The present invention relates to a hinge door check which is a piece of equipment "for closing a door quietly. The door checks known in the prior art are usually installed on the upper side of the door, near the axis of the swinging motion of the door. The main parts of the door check are fixed on the door, and one end of a link of the door check is xed on a lintel. In accordance with the relative motion of the link and door check, the resistance of the oil or air which flows out of the orice cushions the shock of the closing motion of the door. Not only is the link mechanism of the usual door check which moves on the upper side of the door bad in style, but the unbalanced force acting on the upper end of the door deforrns the door itself. Therefore the usual door check has the defect that it causes malfunction of the door hinges and the door lock.

The present invention provides an improved door check in which the above mentioned defects have been eliminated.

In order to make this invention more clearly understood, the accompanying drawings have been provided, in which:

FIG. l is a horizontal sectional view of the door check of this invention;

FIG. 2` is a vertical sectional View of this invention;

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FIG. 3 is a sectional view taken along line A-A in FIG. 2;

FIG. 4 is a sectional view taken along line B--B in FIG. 2;

FIG. Y5 is a sectional view taken along line C-C in FIG. 2; and

FIG. 6 is a sectional view taken along the line D-D in FIG. 2.

Referring to FIG. 1, a spring hinge 27 acts to close the door. The cylinder 1, forming the main part of the door check, is set horizontally in the body of the door 28, and the left end of the cylinder 1 is fixed by the pins 26, on the cylindrical part of the |bracket 9, as shown in FIG. 3. The bracket 9 has a ilat part, as shown in FIG. l, and is connected to the one arm 27a of the hinge 27 by means of rivets. A -bracket 7 is riveted to the other arm 27b of the hinge 27. The right end of the bracket 7 is bifurcated as shown in FIG. 2, and holds the link 4 by means of a pin y6. As shown by the dotted line in FIG. l, as the door is opened the link 4 draws the cross-head 3, which is connected to the right end of the link 4 by a pin 5, toward the hinged end of the cylinder. The right end of the cross-head 3 is in the shape of a bolt 29 which is threaded into the left end of the piston-rod 2. The right end of the piston rod 2 has thereon a piston 30. The piston 30 has three oil holes 31, as shown in FIG. 6. On the opposite side of the piston 30 from the piston rod there is a round shape valve made of synthetic rubber. The upper quarter of the synthetic rubber valve 15 is bonded to the piston 30. The end of the piston rod 2 nearest the hinge is inserted in the synthetic rubber packing 14, and the end of the packing 14 nearest the hinge is bonded to the packing holder ring 12. The packing holder ring '12 has an annular groove, and is ixed with a semi-circular key 13, as shown in FIG. 5. The packing holder ring 12 is -ixed in position as shown in FIG. l. After assembling, the outer surface of the semi-circular key 13 is packed with solder so as not to leak the oil. In the right end of the cylinder 1, there is a cylindrical ring 17 and cylinder bottom 16 which is inserted slidably in the cylinder 1. The right end of the cylinder bottom 16 is in the shape of a bolt, holding a washer 19 and a nut 18. The ring 17 is fixed to the cylinder 1 with a small screw 21, positioned as shown in FIG. 2. If the nut 18 is turned clockwise, the cylinder bottom 16 is pulled toward the nut 18, and the synthetic rubber O-ring 20 is compressed between the cylinder 1, cylinder bottom 16 and cylindrical ring 17. All of these contact surfaces are packed so as not to leak oil. The space 32 between the piston rod 2 and the cylinder 1 is filled with oil.

Now, if the door is opened, the two arms of the spring hinge 27 will be opened as shown by the dotted line in FIG. 1. As further seen from FIG. 1, the link 4 moves toward the left, then the cross-head 3 slides toward the left, and the piston-rod 2 and piston 30 move toward the left. As a result, the oil in the space 32 flows out through the three oil holes 31, pushing open the synthetic rubber valve 15. When the door closes in response to the spring `force of the spring hinge 27, the valve 15 shuts and the oil cannot return to the space 32. The oil presses the end of the piston 30, thus controlling the door closing speed. The oil trapped in the 4chamber to the right of the piston llows through the oriilce 33, the size of the opening of which is controlled by a needle valve 34. The oil flows toward the left and returns to the cylinder 1. The needle valve 34 is elongated toward the left and extends through a synthetic rubber packing 24. The diameter of the left half 22 of the needle valve 34 is sufficiently large as to be rigid enough to prevent said needle valve 34 from bending. Since the right end 23 of the needle valve 34 is a bolt, the size of the needle valve opening can be adjusted with a screw driver from the position of the arm of the hinge 27. The nut 25 is xed by means of solder to the arm of the hinge 27. Thus, the closing speed of the door is controlled by turning the needle valve 34 clockwise or counter-clockwise. For the purpose of holding the door open, a compressed coil spring 1-1 and a steel ball 10 are assembled in the hole of the cross-head 3, as shown in FIGS. 1 and 4. When the door is opened to its final position, the ball 10 catches in the hole 35 in the cylinder 1, thus preventing the door from closing. When the door is opened roughly, the piston 30 strikes the synthetic rubber packing 14 at the end of itsstroke and the synthetic rubber packing 14 is compressed, giving a shock absorbing effect. The needle 4valve chamber 23` is soldered to the upper side of the cylinder 1, as shown in FIGS. 2, 4, 5 and `6, so that oil will not leak from it.

As described above, the door check, thus assembled, is installed completely within the `door 28, as shown in FIG. 1, there is no projection or link mechanism on the outside of the door. And, for example, if there are three hinges on one door, and the present invention is applied to the center hinge, the door will not twist as often happened in the prior art resulting in the disarrangement of the other hinges or of the door lock. And if the door has two hinges, it can be applied to either the upper hinge or the lower one. Comparing the present device with the usual door check that is installed on the upper end of the door, the amount of twisting of the door is rather small.

It is certain that a good style door can be supplied at a lower price by the adoption of this invention.

What I claim is:

1. A hinge type door check comprising a cylinder having one end rigidly attaCha-ble to one arm of a door hinge, a link pivotably attachable to the other arm of a door hinge, a piston slida'ble in fluid tight engagement within said cylinder, said piston having a piston rod thereon eX- tending toward said one end of the cylinder and to which said link is pivotally attached, a fluid tight packing in said cylinder around said piston rod and through which said piston rod extends in fluid tight sliding relationship, a one way valve in said piston permitting fluid to pass only from the side of the piston `facing said one end of the cylinder to the other side of the piston, and an adjustable bypass valve on said cylinder providing a bypass for the Huid from said other side of said piston to said one side of said piston, said check valve comprising a flap of exible Huid impervious material on the said other side of said piston having one segment secured to the face of said piston of said other side and said piston having a plurality of ports over which said fiap is positioned, said packing having a face facing said piston and acting as a shock absorber when struck by said piston at the extremity of the piston movement toward said one end of said cylinder, and said piston having at the other end thereof an adjustable inner bottom and a further packing between said inner bottom and the said other end of said cylinder, and means connected to said inner bottom `for moving said inner bottom toward said other end of said cylinder and compressing said packing to force it against the cylinder wall and provide a fluid tight seal.

References Cited UNITED STATES PATENTS 1,176,802 3/1916` Williams 16- 54 BOBBY R. GAY, Prima/y Examiner.

J. L. KOHNEN, Assistant Examiner. 

